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Updated: May 8, 2025

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Published on: June 16, 2023
A method of reference phase velocity selecting for bearing estimation with a horizontal line array in shallow water
Dai Liu1, Feilong Zhu1, Yanjun Zhang1
1State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, Chinaliudai@mail.ioa.ac.cn, zhufl@mail.ioa.ac.cn, zhangyanjun@mail.ioa.ac.cn, pzh@mail.ioa.ac.cn.
Abstract:
In shallow water environments, choosing an appropriate reference phase velocity for direction-of-arrival estimation with a beamformed underwater horizontal line array is very important. The direction of the maximum beamformer output power will deviate from the true source bearing when a mismatched reference phase velocity was used. This Letter analyzed the intrinsic relationship between the reference phase velocity and normal mode amplitude distribution, source bearing, array aperture, and then proposed a multi-parameter weighted reference phase velocity selection method, which has improved the accuracy of source bearing estimation. Numerical simulation and experimental results validated the effectiveness of this method.
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